Highline Thermal Leggings

Some chase the good weather. They plan everything according to convenience.

But others…well we don’t let cooler temps, mis-timed seasons, or mother nature dictate what we can or can’t do.

To us, we require more out of our gear to live life on our terms.
And that’s exactly why we need gear designed for maximum performance, such as the Highline Thermal Leggings.

  • More Warmth For Less Weight: To us, nothing is basic and nothing should be overlooked, so when we decided to design thermals we started by researching and testing a wide variety of fabric options, eventually landing on an ultra lightweight, 100% polyester, Japanese fabric that is lofted on the inside using a proprietary method to give you the most loft for the weight in its class.
  • Excellent Stretch With Faster Dry Times: The highline thermals offer great stretch and shape retention without the use of spandex - allowing less weight, faster dry times and more comfort next to skin.
  • Superior Temperature Regulation & Venting: When using thermals during the day or sleeping in them at night, a common problem is venting in target areas. We’ve added a vented crotch gusset to ensure warmth in the right areas and eliminate overheating in others. This allows you to extend your time in the thermals or sleep more comfortably through the night.
  • Ultralight Weight & Packability: These sub 4 ounce thermals take the edge off of those cold mornings, late nights or brisk winter trips all while packing down to nothing in your pack.

Whether you're embarking on a cold-weather hike, seeking a more comfortable sleeping set, or simply braving chilly mornings, our Highline Thermal Leggings will keep you warm and comfortable without weighing you down.

Weight: 3.5 oz (size S) or 4 oz (size L)



Gusseted mesh crotch for optimal ventilation

100% polyester Japanese fabric

Brushed with proprietary process for maximum loft & warmth

Smooth exterior for better durability

Great stretch & shape retention

0% spandex for faster dry times & lighter weight

Very warm for ultralight sub 4 oz weight



    • Main Fabric: Proprietary polyester fleece by TORAY
    • Fabric Weight: 102 g/m2
    • Secondary Fabric: jersey knit mesh
    • Inseam Length: 30" (size M) -length changes 1 inch per size
    • Color: black
    • Gender: Male
    • Warranty: Outdoor Vitals Performance Promise

    Layering Collection: Kinetic

    Layering Category: Moving Set or Baselayers

    Product Care

    Your Highline Thermal Leggings are a high performance piece of gear. They need some extra attention to keep it performing at the highest level.

    Please read through the care instructions below to ensure that you care for them properly:

    Before Washing

    • Never wash your Highline Thermal Leggings with anything with velcro or similar hook & loop characteristics.
    • Never wash your Highline Leggings in a washing machine that has an agitator.
    • If you cannot follow either of these prior instructions you should hand wash your product using the detergent and drying process described below.

    The Wash & Dry Process

    1. Machine wash cold
    2. Do not use bleach
    3. Tumble dry low heat or hang dry
    4. Do not iron

    For more information on caring for your gear please visit https://outdoorvitals.com/pages/care-guide-faq




    Highest Loft for Ultralight Weight

    a warmer, lighter, & breathable fleece thermal legging

    Max Loft

    High Warmth + Ultralight Weight

    The proprietary brushing process used by our partners at Toray give this fleece an exceptionally good loft - providing very high warmth value despite such a light weight!

    No Restrictions

    Breathability + Comfort

    The gusseted crotch made out of ultralight & soft mesh allows you to keep a more comfortable temperature where it really counts - whether you're actively moving in cold weather or just using the Highline Leggings as sleepwear at camp.

    100% Polyester Japanese Fabric

    Stretch + Shape Retention

    This ultralight 100% polyester fleece has great stretch capacity & shape retention - with no Spandex. This allows our fabric to dry more quickly and weigh less than comparable fabrics that implement Spandex.

    recommended use

    Cold Weather Active Performance/Sleeping Set insulation

    The Highline Thermal Leggings are perfect for wearing beneath other layers on cold weather adventures or keeping cozy at night in your tent. Stay warm & comfortable without sacrificing breathability & ultralight weight.

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    Customer Reviews

    Based on 30 reviews
    Jon Nelson
    Great product!

    I had my doubts but no more. The warmth to weight ratio is great. They weigh next to nothing and they’re really cozy. I wish there was a quarter zip top made of the same fabric-hint, hint.
    Fit is loose enough that you can get away with wearing them as pants but tight enough they feel comfortable under snow pants or rain gear.
    I should add that there was some trouble with my order and customer service was prompt friendly and quick to resolve the problem.

    Ray Evans
    Truly class leading performance

    These leggings are comfortable, not too tight, and very warm for the weight. I have a fleece top in a similar weight fabric, and the Highline leggings have noticeably more loft. They are loose fitting enough for me to wear over a pair of running shorts, I've taken them down into the 30s and been comfortable.


    Used these during my last two hikes and the comfort level is amazing. It was about 35 degrees F and I was good. Definitely a keeper and I recommend it.

    Justin Foutz

    I just wore them on an overnight hike in the Laurel Highland mountains on January 29 and 30th. Temperature dropped down into the mid 20s., the leggings paired with my Satu pants made the perfect combination. Not once did I feel cold or restricted while hiking. I highly recommend these leggings as I do with all of the Outdoor Vitals products that I have purchased in the past. your company has been my go to for outdoor gear for the last two years.

    Highline Thermal Leggings

    I hiked with these leggings on and I love them. They are very comfortable, light and kept me warm the entire time, even when I stopped for breaks. Perfect for my AT thru hike, I wore them with shorts, as advertised.